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For the rest of the samples, UUnP encountered the exception handler routine and was unable to proceed to later execution steps. Nevertheless, note that UUnP is very efficient as it can extract most hidden code in less than 10 seconds. We obtained the analysis results of PolyUnpack [18] by submitting samples to the Malfease website [13] of which PolyUnpack operates as its sub-module. We also asked the PolyUnpack authors to run our samples against a version of PolyUnpack that handles some forms of structured exception handling in addition to the functionalities presented on the Malfease website.

Obviously, a hook H is one of the impacts made by the malicious code, and this impact finally redirects the execution control flow into the malicious code. Hence, if we are able to identify all the impacts of the malicious code, and observe one of the impacts being used to cause the execution to be redirected into the malicious code, we can determine a hook installed by the malicious code. Furthermore, we are also interested in how an impact is formulated, 46 5 Hooking Behavior Analysis for the purpose of understanding hooking mechanism.

In addition, we need to know the actual arguments that are used to call this function. The function call and its argument list can give semantic information about how the hook and what kind of hook is registered. For example, if we identify that a malicious program calls SetWindowsHookEx to register a hook, we are able to tell from the first argument what type of hook is registered. For this type of implanting mechanism, the hook graph answers the following questions: • What is the external function, including its entry address and its name?